I am using RB911G-5HPnD or RB912UAG-5HPnD boards as CPE in a PtP link in benchmark setup ("on the table" with RF cables and attenuators ~80dB on each RF chain). For AP i have RB411GL+R52Hn.
UL and DL RSSI is about -60dBm on each chain.
In this scenario I'm unable to achieve 100% CCQ value on DL (RB911/912 card receiving) no matter the channel bandwidth. I have 100% CCQ only on UL (RB911/912 transmitting).
There is a slight improvment when using nstreme, rather than nv2.
Any known RF problem in there, or compatibility issues between new atheros chipset of RB911/912 and AR9220?
The above problem is not observed when using RB711G-5HnD boards as CPE (even at -70dBm RSSI i have 100%CCQ).